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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b3ba1208e7029e9e37ca016f103b441d9492c1d12ac0793ecc4a722d96ff74' 
  AND token = '/56qDU5PCSmg7OSLbyPMzBOGqJ1vNoIWTP9Qj9MDbWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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