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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cb3dc7eea93d36cb040cfaa0277093a51b499563968b700897d57cdbf0b67c' 
  AND token = 'umvkn2w0XXU13xYu7YedBTM+MXD8Ezl5kI971dmQD0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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