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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001aef5b7882f9ca0e307b2335a80663380ca938fa2356cc3c77563b1f156c00' 
  AND token = 'P8QXJgd7lebUB4VuAoqwyRkE1kOSojybpa1G1Pbn7MA=' 
  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"
    }
  }
}