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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb33074912d2d9eec00bcab125d235f0d728d3b612a984d0464903c80546b54' 
  AND token = 'th9VJnDeU1D2zhvI/XRWcvvBNWQW5v6WBp8Dy7suuZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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