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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd8c8945918150140862ef9d2f79ad905031dd3e2f4c2e4e5c881a24cc942e1e7' 
  AND token = '2pbxcaG1Ur9aU9fjdRiPKqbuo2UK4ilbUXZXSFlFSFk=' 
  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"
    }
  }
}