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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037a382bd4de3a066e2569a2b37a5e63f0b27538c8050a37c356684fff9489bd' 
  AND token = 'z9Sdcz5PkvwMGIuSmV4NcBdQMFR32XVP6HO5SVG13PM=' 
  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"
    }
  }
}