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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac0fedaf5fd71ec49329535fe553a9e9ff3d7ff91cd4f8ec9dbb8c1cd2599e8' 
  AND token = 'lJorQsYjNo9lPpSdU7OwOy7lt7UORM9bU3XLvW2/x4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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