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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5342325134d53773909befe6c6b03f1dbe8ecb561a8fd161718417c9999d54' 
  AND token = 'LRs/dfys6UIqCXGhceksX0XR/P3YSEEqaqtq8hSG1Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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