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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa9eec3cf75cfbad7942fb91c5ab03c758681f78cb2e61f236545287f3db80c' 
  AND token = 'dQRF97DjmxiiFT1jJWwIHQ85DoH/MZDEO5YOskR3vp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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