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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8057639fe26a18dcc23358d8b74abcaa08206e701db7e1b09aea4d34ac2b1af7' 
  AND token = '6Ispc+dCiL4l2W8JvziMOuozC1ziS1wc3QBcCu8MNP0=' 
  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"
    }
  }
}