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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed459a28880e871c706aa796863cb85328c9b7e602603522c2f8a9febd801e3' 
  AND token = 'ZtjTpDd+Y9q7gD6wchVUidyiiLx527DiVut/URG5O9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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