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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045cd14abcfed4a317cf9427cd6db2e99cd19c3f30d42d9a27f9af3a3ef61b42' 
  AND token = 'gEjG86a8dzSBRwo4xGr9pBNTE9UCzPozhbqZjKfCV3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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