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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1447866ae0c68eb66f2e179a923e4ad96ce27420c6f83dcd20f81e5a9abc87eb' 
  AND token = 'Dk+Nh5iaVqR+a7++yCCdEJb7L8MtfzG6EMPbilV8Fso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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