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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dce0d1f06964ce4dbaf83050a8074e9f8f7caf56c4a6ca75f331b80fd7a827' 
  AND token = 'F2p/ZJNZ+0Cee6B7ZwxVrCmc6xyOVOx6VB7eCytc3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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