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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c5f526c4cb2895b08bbe0e7c4c91e4643d24dc30d20a234bcb52bc6f9b5427f3' 
  AND token = 'leN3XtDHPAHHFPKqIbwLvspGVM3i6Cs68uXYDFdYOmw=' 
  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"
    }
  }
}