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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b483f9e69a4b3618a0e154c21194e2e46cacfd348ef909fc987d456d4cdf8838' 
  AND token = 'lRtaGCHo8rMH8gDbcuAMf+r0f7Bkq2SHiOFEKr5aLXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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