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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e805bfa67f0848cc5ad5b6ca2f98b4def6a4221fc59938303717b9c8430cada0' 
  AND token = 'HVb9jSAcCFBD1DiZt4nuga3WkANsDblPcNL2Y9YoG9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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