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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870c0af25738fcae3b6322f278b05f38dedcaa7fa6b01caf00f0f50c388f4232' 
  AND token = '3iFh/rPVu73kRLFHAm9IuA0hatOCiR59wYXtWrDDK+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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