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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de02756e14ef75bc2fb158792c44b489af402d39b5aaef9101ef908af659d0a4' 
  AND token = 'vE6USKuXxAl29DbBU0YeAoKX+6ZG24xS2FwnhUMVTjw=' 
  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"
    }
  }
}