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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a022e2e9c1217e57c8b5088ef1505decd1c8ee435950d28d1bac3ea44c8b84' 
  AND token = 'V67DucFykcgcxtVXO/fz1toiZhgP2HnMd96IGWdvoug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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