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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95663a9e184f5476c1ad8be0ef521e4449e56ffc74c441987f01f3d2444a5491' 
  AND token = 'q7zRLOlmklVPMcRkvaV1CMyGP/nyMPfQb3ZCTf8u/xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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