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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e23c73f80e934e0b85be0f018cb2b11ced89585709f899a4e104a44a5af6cac' 
  AND token = 'A/hxe/r1bb6FgIC74oJWy9H/UszXbE4KIWMBu2rjBP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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