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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f6afadedff2e542a2bbe1846673c1c843aaefe891f862801ef4f43c966fd30' 
  AND token = 'o40MwHhLFzAinWfz4M0hCKZrCHKBaZzI4j11CkHCjrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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