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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e288fc1e7bf7938730c8f4039297a13c46d3e173ebc3bb93f98b86857187dd79' 
  AND token = 'eYY2FSsK8xLiKbZL+GQ0CCw6YrDjuSzCSVpqTfdbFl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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