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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'de2a26d0e8554245319e65bb6e239c77461fcaeaf586e885aeaad3e7c211b20c' 
  AND token = 'G4Ug/qji/jJTPJ4Hf84rMj0Sfzu+6TRKTjywRR3iagA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}