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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc95d30e09c1220c46eef98d50f45a777f893ca4ceb3b50093ce74a56af9552a' 
  AND token = '6ZF3t2drRQKyXBcI2O9GLmrzd+CjyNiVIsL/wdzz+zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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