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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4766137d2ab8a0b99d5e6785465420e656771b1949a286d923d7ba7b0ba4db' 
  AND token = 'ZtphtfTC+Sw4/groSXZHaPuc2I46VximlK5y+amHm5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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