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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1003987c9267348868507a92e6a8514f1be2bf1e1075ec3488749eb038a2b8' 
  AND token = 'mQWl8/8uGFw10x1M+AseQi3kc9zl/VSnuPGefSVJD3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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