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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb9aba3da28ef528b20311c7ed565efd940372260407128c0c1e8ad82d5839a' 
  AND token = 'XGxCjwVFSmOQ7PNjNc/pn8N4dEGP5CIPVY8JIdQAi60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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