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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db29c1c2830b0a4cdfe84065e04c93bb7e810a46ed08aab27a3a1d3d9e08c6e3' 
  AND token = 'Aq4K3cwfFUcpry2uEZBLaLPpuXFRCXG4BKLzS6bhyaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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