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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e57d2d9353b3ce17c8cfff67d4539bd5a9c37c1077eec337018a77d4eac278' 
  AND token = 'P7885kf4nS9eiU8yEcPKp8r0Ed5vsngw+FQCCqSVXJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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