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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ddc77619e14c5ca8d555217306e3ad961225f2a65ad147c621de6ab65147c0' 
  AND token = 'DxjsmccIqRUwA2VGWTftut4BymsTM4Hzqp+2R8u3gOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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