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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3463f233e3a232f84dc9f2726fac9a5c0aa394cdba177f5d3016a208458311a' 
  AND token = 'rOUw4pJ1s3i/BBKDlH/3NPL3iY0v1X0Rw2NeUmr0b5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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