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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec40f2d286e6c6878e05e5b682fc6543bea076feb6ecef513894dc3bf8ead3ce' 
  AND token = 'Din8bJG6s95p3FEEpuZWrp1lMh/F21HEbWnRx4ld/QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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