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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffa7ca5425802653b81ec143f1f33ebd847be1f53ec1831359f556ac3368934' 
  AND token = 'CkU6meW1hmy2j4j/VxwP5f/dxK7EMlXZM2wwMm6TBns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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