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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1fe5a625f7dac6b593c4edee6faedb49e61a505aa2cf9908f72c8238e20bb1' 
  AND token = 'PbFKrbRXBukok9OvDfbc7++11HGve5Dd2KZQ1vtFehI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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