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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2037f615efa14bb76e8927ace59df95f949d2eba39286d897f312dfd3df3e7fb' 
  AND token = 'wZt6oGQv91NgRK8uSjo9AbKY86RAY/GE5ZqF1ptNaZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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