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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f12d92b8a756e685ad1767c14218ce2e290954a0b1b4989084075df1f135009' 
  AND token = 'bDy4eDwLzJn5XdLNjxuL4Hbm43qA1/QvcP0lyPjDJOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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