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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e99d1d42c8df26043af097500d0c040c27ccd6a867d8dcac526840bd7e7566c' 
  AND token = 'QjXfnO7ImyUgfWGXEmGQ/945NHhi4ghaRowjiZj2qAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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