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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5320e1e7b51110338ea7533eb4f452285171e4a4166566d887d2a12386c86712' 
  AND token = 'VaRFn3dphCWb9BNTJeECKtBX+N5PWZYUjyg48/pdf4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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