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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6d7d7e73cf629a6c07eb8e36c8300d3ce18f315396852d13a3df8da2168a4b' 
  AND token = '2kcJtO0sHfZKdMx4QvXXVOwmv0pqdHs4SaH5kTbmN4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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