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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ab433455ef01e141eab2857219171c8a3d8ca41f4e9b05c594c5121e06aaad' 
  AND token = 'CCx+Dnr5NjGf2Z3Vyk0SkR7D1uXvqbFwtovogk3d56E=' 
  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"
    }
  }
}