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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5305e774ced277bc9e42fd718dc49ac1f30aff3eeb28ddf09d5062f9d65ce554' 
  AND token = 'gsZs/V6PXehTCsmSCg+oMuQaSimVSn5QC6/Q2exUbvI=' 
  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"
    }
  }
}