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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7b90ab7b54a3f33a04257adc4bb39ae608f06146c311aba097c728fc2649b3' 
  AND token = 'oAtSudYTlk8ro7BqacJlN0/Dp45sxsn0/+I6/VRrkVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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