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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57540f8c0019eb3d61bf51dd0877c57a9334f2510fd9817535e2e5f9a9fb5be' 
  AND token = 'tuIQeLZcmP4YR2nrEj09LT81sbCdZezZz/fNjghE3QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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