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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91832bce2f82790d90812a7bc5e16345c213f76604dd66fb7166a37253b62a3e' 
  AND token = 'GiPbvqG1m/Gct617tXQKYh8iO8Of71e+v2L7ah9SAk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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