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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aae62f7166070a8409c7250bd9a8d382b260025f1b0e8067c1865bbeef1dd79' 
  AND token = 'vxDBSKT2jdUASCxQf6nrH8uAcmZ4FTG5Fo54Nz7pgFg=' 
  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"
    }
  }
}