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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa628c460ca6e0edea2a9157e5df97584c94cc2fa14797781725eee8a84506a' 
  AND token = 'q8L18PKG6DqzL43bnrGYDwdKtei3ocgUVNxRDy8S5QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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