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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb286bc1102794df3c633d51383ecd7507089e0c552e3c38242cdf78c22116a' 
  AND token = 'g5GQ6d07B16HljCoqyx4rngW0ObQv8SsQ3jkGUSjkEE=' 
  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"
    }
  }
}