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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7950a1ce46bcb75272417544e4aae22752bee108512991e73521f225a70d82d5' 
  AND token = 'kv6IJFoORLA7YBJrI+5g4X7QrU5ecmEOe80nFP3lBkE=' 
  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"
    }
  }
}