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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e1a66b4f5e2d99c8b5e7089cec15b8e8e98a20aa7634e851709484c70abbd5' 
  AND token = 'ifTaU3f8zriTyEJo4xU/qKHk80tffiLmzqeInu+/LMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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