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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2680c6c10405407834b2ce7f16b7be8d5cbc6ebc1e260de88a4e72048c71d9e' 
  AND token = 'ThbYu4YBdSYdKOO5k+kh+ugBASP1IrbVSL/8Mkb4YKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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