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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb91e3c1d765d1e6d754a89151ef8e142266495f3a9744c045ccb241b6aedc06' 
  AND token = 'xPtQ5aOH9BlCTYxIDzMRd60vbXzZpvzEmrwkwqi3wQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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