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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec7034f3146713d90d1ce304fd890661e518702d5b05a8d6ab1813746ec500d' 
  AND token = '1JmclIqh34F49R1Vxpgob6MeK5Mp6mZnTeeWM5C7kk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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