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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66496c4e49242cc196a2e5efad52fbae59ba6f5d32efa6d3e751f24be1567246' 
  AND token = '01eCuvGe44Z08Z/l1BHdK+g50CNZ4zCsGF/qQ8q3z5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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