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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab0ac42b7e8804114c7e7ca7bf88dcbaf5dcc984aeb82b964c5dd36f0849dc4' 
  AND token = '+ehxQvs68BOmng9xm5VqQZSlCDfSMRNQHatIpf0rPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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