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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1847f23d82455fb18378a68c52c6f01b7acf9f7abd22d2b7a0f20f38b5860184' 
  AND token = 'rmoXAXDG+rbzUHp6O7+mfUaASWtwe1S22AJzVoArZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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