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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2b9e3b70683731556274b426a24dc394b0d0e0c54d7b99608e832782e759a5' 
  AND token = 'vkDJRcqhCH2vZh0sH5UCtoBNKPb8oQ7/vvW7chw/Kfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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