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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41aac3d8bc1e1c00022ad987cee0e9bd484719e0147e97fe4be267e4ecc4ddc8' 
  AND token = 'hjQmW5fGRtt2Em1pwiQC7NegVD4V08UhreaaG/gbftA=' 
  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"
    }
  }
}