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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284fdc05eb2e29d96a5fb64818ad63add63492a14996f9484b29efe8fd9a56dd' 
  AND token = 'rMXooWKgJSNJ4/y953RzaZ0yZ7367xzfGC9gn6BJh7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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