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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19413b2281fc7e261e4cc4812c95b6b7eb5b91d2ed6c3210a8dae0ff1b821b96' 
  AND token = 'Q2IIlLeO2ClTHWMc/7i6pQSdVHL1w8ZCi4Mr+PGuixc=' 
  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"
    }
  }
}